Why Roth Accounts Often Look Better in Long-Term Modeling
One of the biggest findings from the presentation was surprisingly consistent:
Across the simulations presented, overweighting traditional retirement accounts was never the best-performing strategy.
That doesn’t mean traditional accounts are bad. Far from it.
But the modeling repeatedly showed that:
- balanced Roth/traditional allocations performed well,
- and Roth-heavy allocations often performed slightly better over long time horizons.
Why?
The answer largely comes down to required minimum distributions.
Traditional retirement accounts eventually force taxable withdrawals beginning at age 73 under current law. Those RMDs can trigger a cascade of tax consequences, including:
- higher marginal tax brackets,
- Medicare IRMAA surcharges,
- taxation of Social Security benefits,
- and additional investment income taxes.
Roth IRAs, on the other hand, are not subject to lifetime RMDs for the original owner under current rules.
That flexibility can become extremely valuable later in retirement.
The Simulations Produced Some Interesting Results
Horstmeyer modeled several retirement allocation approaches, including:
- a 50/50 Roth-traditional split,
- a Roth-heavy allocation,
- and a traditional-heavy allocation.
The assumptions were intentionally simplified:
- static tax rates,
- consistent annual savings,
- long-term portfolio growth assumptions,
- and retirement beginning at age 65.
One scenario modeled a client who delayed retirement withdrawals until age 75.
Under that simulation:
- the Roth-heavy strategy finished with roughly $2.88 million at age 85,
- the balanced strategy ended around $2.80 million,
- and the traditional-heavy strategy trailed slightly behind.
The differences weren’t enormous—but they were persistent across many scenarios.
And importantly, the analysis repeatedly highlighted how future tax exposure—not just investment returns—can materially impact retirement outcomes.
But Real-World Planning Is Messier Than a Simulation
One of the strongest aspects of the webinar was Horstmeyer’s willingness to acknowledge the limitations of modeling.
He repeatedly emphasized that no retirement strategy exists in a vacuum.
The simulations assumed static tax rates, which almost certainly won’t reflect reality.
In practice, retirement planning decisions are influenced by:
- future legislation,
- changing tax brackets,
- healthcare costs,
- state taxation,
- charitable planning,
- estate planning,
- and Medicare premium thresholds.
In some cases, traditional accounts may still make perfect sense.
For example:
- high-income earners expecting much lower retirement income,
- clients relocating to low-tax states,
- or retirees planning large charitable giving strategies
may still benefit significantly from traditional tax deferral.
The session reinforced an important truth:
Retirement account strategy should rarely be one-size-fits-all.
Roth Conversions Continue to Generate Attention
The webinar also explored Roth conversion strategies—one of the most heavily discussed planning topics in today’s tax environment.
Horstmeyer modeled three approaches for a hypothetical retiree:
- Leave assets entirely in a traditional IRA
- Convert everything immediately into a Roth IRA
- Convert gradually over a 10-year period
Interestingly, the simulations generally favored Roth conversions over leaving all assets in traditional accounts.
And somewhat surprisingly, full immediate conversions slightly outperformed gradual conversions in the modeled scenarios.
The reason again tied back to RMD avoidance and preserving tax-free compounding inside the Roth environment.
But the presenters were careful not to oversimplify the conclusion.
Because in the real world, Roth conversions can create complications, including:
- IRMAA surcharges,
- higher marginal brackets,
- state taxes,
- taxation of Social Security,
- and liquidity issues if clients don’t have outside cash available to pay the taxes.
The webinar emphasized that Roth conversions are often most effective when taxes can be paid using non-retirement assets.
Estate Planning Is Becoming a Bigger Part of the Roth Conversation
Another important theme throughout the session involved multigenerational planning.
Roth accounts can create significant estate planning advantages because beneficiaries generally receive distributions income-tax free, even though inherited Roth IRAs remain subject to SECURE Act distribution rules for many heirs.
The presenters noted that advisors increasingly need to evaluate retirement accounts through a broader lens that includes:
- legacy goals,
- beneficiary tax brackets,
- trust structures,
- and long-term family wealth transfer planning.
As tax laws continue evolving, retirement accounts are no longer simply accumulation vehicles—they are also estate planning assets.
Inflation, Commodities, and TIPS Entered the Conversation Too
The webinar extended beyond retirement account structure and also addressed inflation-sensitive portfolio design.
Horstmeyer reviewed historical data showing that modest commodity exposure:
- reduced portfolio volatility,
- improved diversification,
- and performed especially well during inflationary periods such as 2021–2022.
However, commodities were also described as imperfect tools because they:
- produce no income,
- can lag during disinflationary environments,
- and may increase portfolio complexity.
The discussion around Treasury Inflation-Protected Securities (TIPS) was equally nuanced.
One key takeaway:
Investors often buy TIPS too late.
By the time inflation becomes obvious, markets may have already priced inflation expectations into bond markets, limiting the relative advantage of purchasing TIPS after inflation spikes are widely recognized.
That distinction is especially important for advisors using TIPS tactically instead of strategically.
Flexibility May Be More Valuable Than Certainty
A recurring theme throughout the webinar was uncertainty.
No advisor knows:
- future tax policy,
- inflation levels,
- longevity,
- healthcare expenses,
- investment returns,
- or future withdrawal behavior with certainty.
As a result, Horstmeyer repeatedly emphasized the importance of maintaining flexibility rather than relying entirely on rigid rules of thumb.
Diversifying across tax buckets may still provide valuable optionality, even when modeling favors one strategy under a particular set of assumptions.
That balanced perspective was one of the most practical takeaways from the entire session.
5 Questions Advisors Should Be Asking Clients About Roth vs. Traditional Accounts
1. What is your likely future tax rate—not just your current one?
The entire Roth vs. traditional debate hinges on whether future taxes are likely to be higher or lower than today.
2. Will required minimum distributions create future tax problems?
Large traditional account balances can trigger higher Medicare premiums, Social Security taxation, and compressed tax brackets later in retirement.
3. Do you have outside assets available to pay Roth conversion taxes?
Paying conversion taxes from taxable assets generally improves Roth conversion efficiency.
4. How important is estate planning flexibility?
Roth accounts can provide tax-efficient wealth transfer opportunities for beneficiaries and heirs.
5. Are you planning for inflation strategically—or reactively?
Commodity exposure and TIPS may help with inflation protection, but timing and implementation matter significantly.
Final Thoughts
The Roth-versus-traditional debate is far more nuanced than many planning conversations suggest.
This webinar reinforced that retirement account decisions cannot be separated from:
- taxes,
- withdrawal timing,
- Medicare planning,
- estate strategies,
- inflation,
- and behavioral flexibility.
Perhaps the biggest lesson wasn’t that Roth accounts always win.
It was that thoughtful planning often beats rigid formulas.
And as tax policy uncertainty continues to grow, advisors who can integrate retirement income planning with tax strategy and behavioral coaching may deliver the greatest long-term value to clients.
